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UNITED STATES PATENT CEFICE.

IEAH D. SPAULDING AND DAVID N. B. ooEEIN, JE., oF BOSTON, MASS.

COPYING-PRESS.

Specification forming part of Letters Patent No. 52,086, dated January16, 1866.

To all whom it may concern:

Be it known that we, IRAH D. SPAULDING and DAVID N. B. GOFFIN, Jr., bothof Boston, in the county of Suffolk and State of MassachuSet-ts, haveinvented certain new and useful Improvements in Presses for CopyingLetters and like Purposes; and we do hereby declare that the followingis a full and exact description thereof, reference being had to theaccompanying drawings, which make part of this specification, and to theletters of reference marked thereon.

With reference to the drawings, Figure l is a perspective view of thepress. Fig. 2 is a profile view of the cam, rolling beam, and lever.Fig. 3 is a sectional view, showing the relation of the sprin gs to theother parts, Src.

Like letters refer to the same or corresponding parts in all thefigures.

The bed-piece a is made with the posts b permanently fast upon it bycasting or otherwise. The posts have each a chamber opening inward andterminating at the top in a suitable bearing for ajournal and at thebottom in a socket suitable to receive a coiled wire or other suitablespring for lifting the follower. rlhe follower c is furnished withprojecting ends, of a form to be easily slipped into and guided bythechamber and its sides, and to form a bearing on the springs. Thespring d may be of coiled wire 0r other suitable material andconstruction, and is sea-ted in the socket at the posts base. Thesesprings (one in each post) support the follower and throw it up from thebed whenever it is relieved from pressure. The follower is alsofurnished with bearings e for supporting cam j'. The camf has a gradualgain, a tluted', waved, or ribbed surface, and is provided withjournals. These journals terminate in hemispheres, and the bearings eare of a corresponding concave shape, and terminate at the height oftheir center, for the purpose of producing a neat nish without tting andfinishing. The rolling pressure-beam g is furnished with the lever l1,or other suitable stop, and has that part of its surface which comesinto action just before the stopping-point decline towa-rd the center,so counteracting a part of the gain ot' the cam and increasing thepurchase at the last partof the movement. It also has a liuted, waved,or ribbed surface, corresponding to that on the cam, suitable to insurethe rolling together simultaneously of the two.

By throwing the lever h forward and down to the follower the follower isforced do\vn ward. By throwing it upward and backward the follower isrelieved from pressure, Iand the springs d throw it up. The camffurnishes the means for adjustment to different thickmesses-as, forinstance, if a thick book is used the small part of the cam is broughtinto use; if athin one, then the large part, Src. The adjustment is madeby holding the cam from turning and throwing the lever backward orforward, as the case may require. The ribs on the rolling beam and camserve also to make the moving parts remain at any desired point of theirmovement, each wave or rib passing the center like a toggle-joint, andserving, with the necessary friction, to prevent the rolling back of thecam.

The parts except the springs may all be made of cast-iron, and thatwithout any other litting than the ordinary cleaning ot' castings, ifdesired, for economy.

Having described our invention, what we claim, and desire to secure byLetters Patent, is as follows:

The adjustable cam j', in combination with the rolling beam g,constructed and applied substantially as and for the purposes set forth.

IRAH D. SPAULDING. D. N. B. COFFIN, JR.

Witnesses:

LEWIS S. SOULE, ARTHUR A. BURR.

